Boat top



FIG. 1 is a perspective view of a boat top showing my new design, the broken lines are for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a rear end view thereof, the front end view being identical;

FIG. 3 is a right side view thereof, the left side view being identical;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a boat top, as shown and described. 